Hi,
Fn + Function keys (Default keys like Brightness Up, Brightness Down) not working in kde daemon functions.
But in kmix function like volume up and volume down are working. I tried to configure custom keyboard shortcut and set Fn + F6 for brightness down but it don't even recognize the keyboard input. It works with custom keys like Alt + Ctrl + B

Thank You
Pradeesh Mathew

If you execute "xev" does it indicate any knowledge of your brightness keys? If it does not, do you see any mention to keycodes in the output of dmesg?

Thanks For the reply
No output for special function keys except F6
output of Fn + F6 ( Brightness down )

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KeyPress event, serial 40, synthetic NO, window 0x4c00001,
    root 0xae, subw 0x0, time 1466077, (673,-17), root:(1355,6),
    state 0x0, keycode 120 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False



dmesg after F6 & F7 (Brightness up)

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[ 1815.426648] atkbd serio0: Unknown key pressed (translated set 2, code 0x55 on isa0060/serio0).
[ 1815.426659] atkbd serio0: Use 'setkeycodes 55 <keycode>' to make it known.
[ 1816.544161] atkbd serio0: Unknown key pressed (translated set 2, code 0xee on isa0060/serio0).
[ 1816.544173] atkbd serio0: Use 'setkeycodes e06e <keycode>' to make it known.
[ 1816.646469] atkbd serio0: Unknown key released (translated set 2, code 0xee on isa0060/serio0).
[ 1816.646480] atkbd serio0: Use 'setkeycodes e06e <keycode>' to make it known.
[ 1817.154124] atkbd serio0: Unknown key released (translated set 2, code 0x55 on isa0060/serio0).
[ 1817.154136] atkbd serio0: Use 'setkeycodes 55 <keycode>' to make it known


Please see https://wiki.archlinux.org/index.php/Setkeycodes for information on how to setup keycodes to allow those keys to be used.
Once that has been done, you should be able to map them to the brightness functions in KDE.